@visions63 When you say encapsulated, what do you mean. I have cavitary MAC going on 13 yrs… one particular cavity changes a lot. On CT it looks blacker, whiter, bigger or smaller. Ive had it biopsied and recently even a pet scan, in addition to regular CT scans. I never heard that adjective used. I’ve been on two sets of antibiotics but not what you were looking at. I’m picking a screen grab of your share here and that doctor‘s name thank you.